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A thumb injury has caused Day to miss his last two starts. (Greenwood/Getty Images)

A lingering left thumb injury has caused Jason Day to withdraw from this week's Arnold Palmer Invitational presented by MasterCard.

It marks the second time in as many starts that Day has pulled out of an event because of the injury -- he also withdrew prior to the start of the World Golf Championships-Cadillac Championship.

Day's thumb has bothered him since his victory at the WGC-Accenture Match Play Championship and he later underwent an MRI in Miami. The results were negative but Day said his plan was to rest for a couple of weeks.

With the Masters just three weeks away, the latest move was at the very least a precautionary one.